Arc-lamp.



G. BALDAUF & E. PRESSER V ARC LAMP. APPLIOATIOH FILED oc'T. 30,1909.

1,023,293, -PateIIted Apr. 16,1912.

Witness es: Inventors:

' Gustav Baldaui.

Erns Presser, 19W

Atty

UNITED STATES PATENT OFFICE.

GUSTAV BA LDAUF, OF AUGSBURG, AND ERNST PRESSER, F BERLIN, GERMANY, AS- SXGNORS TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ARG--LA]YIP.

Specification of Letters Patent.

Patented Apr. '16. 1912.

Application filed October 30, 1909. Serial No. 525,416.

To all whom 'it may concern: I

Be it known that we, GUSTAV BALDAUF and ERNST Pnnssnn, subjects of the Emperor of Germany, residing at Augsburg and Berlin, Germany, respectively, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

This invention relates to, that type of electric are lamps in which the electrodes converge, being carried in holders which slide on stationary converging rods firming a frame for the lamp. The two holders are usually supported on a lmrizontal rail, on which they can move inwardly toward each other during the downward movement of said rail toward the converging ends of the guide-rods. This rail requires a central vertioal guide-rod, and in order to dispense with this and the rail as well and further simplify the construction, we have designed the present invention.

\Ve attach the two holders to the respective ends of" two bars each of which cross .s over tof tho opposite side of the frame and there --,feiigagesslidably by its upper end with the guide-rod on that side of the lamp. The two oted together at their intersectr or point and are suspended at that point cord or chain which is paid out by the ,regu ating mechanism of the lamp in order to feed the electrodes downward. Owing to the convergence ot the guide-rods, it is necessary to bend the cross-bars at their meeting point so that both arms of each bar may be of the same length and make equal angles with the guide-rods. This insures the proper engagement of the cross-bars with the guide rods during the entire travel of the bars between said rods.

The accompanying drawing is a-side elevation of a. frame. sliding holders, and crossbars embodying one form of our invention.

The platforn'i 1 affords a support for the electromagnetic regulating mechanism, which is omitted from the drawing for the sake of simplicity. Attached to the under side of this plattorn'l are two rods 2 which converge downwardly to a 3v which may serve as ti economizer of the lan'ip. The two eleo- Mode-holders 4 are mounted to slide respectivcly on the rods 2, the eleetr (16S passing down through openings .in-the economizer, as

usual. The holders are preferably provided I with anti-friction rollers 5 on both sides of the rods. A bar 6 is pivoted to each holder and extends obliquely upward and across-to the opposite guide-rod, on which it is constructed to slide, preferably with an anti friction roller 7'. At the point where the bars cross each other they are pivoted together by the pin 8. A chain or cord 9 may be at tached at this point and run up over a. pulley 10 to the regulating mechanism if such is en'iployed. The invention is not, however, limited to that class of lamps, but may be applied to those using supported electrodes or electrodes provided with a combustion edge.

In order to maintain guiding contact between the cross-bars and tho guide-rodsat all times, it is necessary that both arms a, Z) make equal angles with the rod; that is, that the two arms abutting against each rod form. therewith an isosceles triangle. This requires both of said arms to be oi the same length and. inasn'mch as the guide-rods converge downwardly, the arm 7) of each bar must make an obtuse angle with its arm a. said angle being the supplement of the angle at which the guide-rods would meet it extend ed. Thus, if this angle, as shown in the drawing, is about 15 degrees, then the angle between the two arms a and b of each crossbar is about 165 degrees. 4

The carbon holders have suiiicient play on the guide-rods to permit the tip of one electrode to be drawn laterally away "from the other by the usual mechanism, in order to establish .the are. ()r, if desired, the necessary separation of the electrodes may be effected by litting both electrodes slightly.

In accordance with the provisions of the patent statutes, we have described the principle of operation of our invention, together with the a 'iparatus which .we now consider- 1. In an arc lamp, the combinatioi'i with converging guide-rods, of carbon holders sliding thereon, and cross-oars pivoteo' to,

said holders and to each other and guided at their ends on said rods. 1, v

2. In an arc lamp, the combination with converging guide-rods, of carbon holders sliding on said rods, and cross-bars pivoted to said holders and to each other at their point of intersection and guided at the ends opposite to the carbon holders on said guide rods, each of said cross-bars having two arms meeting atan obtuse angle.

3. In an arc lamp, the combination with converging guide-rods, of carbon holders sliding thereon, and cross-bars pivoted to said holders and to each other at their point of intersection, the opposite end of said cross-bars engaging the opposite guide rods, all of the angles between the various arms of said cross-bars and theirvguide rods being equal.

4. In an arc lamp, the combination with converging guide-rods, of carbon holders sliding thereon, and cross-bars pivoted to said holders and to each' other and guided it extended.

5. In an arclamp, the combination with converging guide-rods, of carbon holders sliding thereon, and cross-bars pivoted to said holders and to each other and guided on said rods, the arms of said bars abutting against each rod, making therewlth an isoscelestrtangle atall points in the travel of said bars.

In witness whereof, we have hereunto set our hands this l'i day of September, 1909. GUSTAV BALDAUF.

. ERNST PRESSER.

Witnesses:

BERr'HoLD BIONASCH,

FRITZ BAUMANN,

lVoLDnMAR HAUPT,

HENRY HAsrEn. 

